(19)
(11) EP 4 734 241 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.07.2026 Bulletin 2026/28

(43) Date of publication A2:
29.04.2026 Bulletin 2026/18

(21) Application number: 25209401.6

(22) Date of filing: 17.10.2025
(51) International Patent Classification (IPC): 
H01M 50/107(2021.01)
H01M 50/124(2021.01)
 H01M 50/119(2021.01)
H01M 50/133(2021.01)
(52) Cooperative Patent Classification (CPC):
Y02P 70/50; Y02E 60/10; H01M 50/107; H01M 50/119; H01M 50/133; H01M 50/1245; H01M 50/545
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
GE KH LA MA MD TN

(30) Priority: 28.10.2024 CN 202411516759

(71) Applicant: AESC Japan Ltd.
Yokohama-shi, Kanagawa 220-0012 (JP)

(72) Inventor:
  • YANG, Yaping
    Jiangyin City, Wuxi City, 214443 (CN)

(74) Representative: Becker, Eberhard 
Becker Kurig & Partner Patentanwälte mbB Bavariastraße 7
80336 München
80336 München (DE)

   


(54) SECONDARY BATTERY, BATTERY PACK, AND ELECTRONIC DEVICE


(57) The disclosure provides a secondary battery (100), a battery pack (10), and an electronic device (1). The secondary battery (100) includes a housing (110) and an electrode assembly (120); the housing (110) includes an end wall (111) and a sidewall (112) surrounding the end wall (111), the sidewall (112) and the end wall (111) are integrally formed by stretching; the electrode assembly (120) is accommodated in the housing (110); wherein a wall thickness of the end wall (111) is a, a wall thickness of the sidewall (112) is b, 1 < a/b < 3, and the technical issue of battery performance degradation caused by uneven side pressure of the housing (110) on the electrode assembly (120) may be alleviated.







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